Domestic appliance



Nov., 1, 1955 M. E. FRY 2,722,591

DOMESTIC APPLIANCE:

Filed March 19, 1953 5 Sheets-Sheet 1 IN VEN TOR.

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A Horn ey Nov. l, 1955 M. E. FRY 2,722,5

DOMESTIC APPLIANCE Filed March 19, 1953 I5 Sheets-Sheet 2 36 48 Fig. 544 32\ blo 82 @Kw1 IMI I [Wip 76 22 34 n 48 F/g. 6 44 :Il DE] 44 68 384l 70 72 "LQ 4| 74 46 INVENTOR.

Y M/ard E. Fry

Nov. 1, 1955 Filed March 19, 1953 M. E. FRY

DOMESTIC APPLIANCE 3 Sheets-Sheet 5 Fig. 6

96 90 iig F lI|r| F ig. 9 @i IN1/EN TOR. M//Urd E. Fry

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Attorney United States Patent O DOMESTIC APPLIAN CE Millard E. Fry,Dayton, Ohio, assignor to General Motors Corporation, Detroit, Mich., acorporation of Delaware Application March 19, 1953, Serial No. 343,341

Claims. (Cl. 21919) This invention relates to a domestic appliance andmore particularly to a heating unit assembly for electric ovens.

It has been customary to connect the insulated bushing supports toformed rectangular wire frames. Additional wire members connect thefront and back ends of the bushing supports. These wire members andframes are somewhat expensive and use considerable material and are nottoo easily formed.

It is an object of my invention to provide a simple structure forconnecting the insulated bushing supports into a framework.

It is another object of my invention to use the insulated bushingsupports as the sole structural members extending from the front to theback of the heating unit.

lt is another object of my invention to provide an improved baille forsuch a heating unit and to provide an improved and simplified connectingarrangement between the improved baille and such a heating unit.

These and other objects are attained by providing a heating unit inwhich flat metal strips extend across the front and back of the heatingunit and are notched to receive the upper and lower projections providedat the ends of the insulating supports which curl around these strips toform a rigid framework, One of these strips is provided with a centrallylocated ear. The baille is provided with ilanges between which llt theopposite end of the heating unit while the other end of the baille andheating unit are connected to the ear with a terminal block by a boltfastened by a wing nut. The transverse strips are provided withdepending legs at each end and upwardly extending projections whichspace the baille away from the heating unit.

Further objects and advantages of the present invention will be apparentfrom the following description, reference being had to the accompanyingdrawings wherein a preferred form of the invention is clearly shown.

In the drawings:

Figure 1 is a top view of a heating unit assembly embodying one form ofmy invention;

Figure 2 is a side elevation;

Figure 3 is a left end view of the assembly;

Figure 4 is a right end View of the assembly;

Figure 5 is a bottom view of the heating unit alone;

Figure 6 is a side elevation of the heating unit alone;

Figure 7 is a rear view of the heating unit alone;

Figure 8 is a bottom view of the baille;

Figure 9 is a side view of the inverted baille; and

Figure 10 is an end view of the inverted baille.

Referring now to the drawings and more particularly to Figure 5, thereis shown a heating unit embodying one form of my invention. This heatingunit generally designated by the reference character includes fourinsulating supports 22, 24, 26 and 28 which extend from the front to therear of the unit 20. These insulating supports 22 to 28 are formed ofsheet metal into a channel shape with pierced insulating blocks 30lodged in the channels and held in place by ears 32 and 34 upon theflanges of the channels which are bent toward each other and intocontact with the blocks 30 to hold the blocks in place. The channelmembers 22 to 28 are provided with enlarged apertures adjacent theplaces where the insulating blocks are pierced.

Instead of using a wire frame I use thin strips 36 and 38 of aluminumclad steel or other suitable material at the front and rear of my unit20. These strips each have two upwardly extending projections 40 and 42which are used to space the baille member a proper distance above theheating unit 20. To make it possible to cut the maximum number of stripsfrom a sheet, each strip has a recess 41 of complementary shape beneatheach projection. At each end the strips have downwardly extending ears44, 46, 48 and 50 which are bent at right angles to the remainingportion of the strips 36 and 38. These ears 44 to 50 support the heatingunit upon the bottom of the oven or whatever type of support isprovided.

The strips 36 and 38 are provided with four notches 52, 54, 56 and 58 ontheir upper edges. Each of the channel members 22 to 28 are providedwith an upper projection at each end designated by the referencecharacters 60, 62, 64 and 66 which extend through the notches 52 to 58and are bent over in contact with the outer face of the strips 36 and38. The channel members 22 to 28 are likewise provided with lowerprojecting ears 68, 70, 72 and 74 which are likewise bent over the loweredges of the transverse strips 36 and 38 to positively lock thetransverse strips 36 and 38 to the ends of the channel members 22 to 28.

A coiled electric resistance unit 76 is threaded through the insulatorsupports 30 in the four channel members 22 to 28 as shown in Figure 5.lts ends are connected to the terminals 78 and 80 of a terminal block82. To hold this terminal block 82 in position, the rear transversestrip 38 is provided with a ilanged opening 84 provided with a piercedear 86. The terminal block S2 is located in this opening.

In Figures 8 to l0 there is shown in inverted position a baille 88 whichis normally located over the heating unit 20. This baille includes alongitudinal ilanged aperture 90 upon the axis of the baille andstiilening ribs adjacent each edge. The front edge of the baille 88 isprovided with a downwardly turned ilange 92 which of course extendsupwardly in Figures 8 and l0 because of the inverted View. This flange92 is provided with two ilanged apertures 94 and 96 in the locationsshown in Figure 10. The flange 92 is also provided with a rearwardlyturned lip 98 at its lower edge. The baille is also provided with a bolthole 121 at its opposite end.

To assemble the heater 20 and the baille 88, the center portion of thestrip 36, which may be notched to accommodate the lip 98, is placedbetween the lip 98 and the adjacent ilanges of the apertures 94 and 96as particularly shown in Figure 3. At the opposite end this brings theaperture 121 in registration with the aperture in the ear 86 and a bolt123 is passed through these apertures as well as the terminal block 82and fastened in place by a suitable wing nut. This assembly is verysimple. Only ordinary care is required to see that the front strip 36 isin its proper place in the front ilange 92 of the baille 88 before thebolt is passed through the apertures in the members 38, 82 and 88 andfastened by a wing nut. The entire assembly is simple and very usefuland can be manufactured at a low cost.

While the form of embodiment of the invention as herein disclosedconstitutes a preferred form, it is to be understood that other formsmight be adopted as may come within the scope of the claims whichfollow.

What is claimed is as follows:

l. A heating unit assembly including a plurality of spaced parallelinsulator supports formed of metal strips, insulators supported by saidsupports, transverse thin at metal strips abutting the opposite ends ofsaid insulator supports, said insulator supports being provided at eachend with upper and lower projections which curl around the adjacentportion of the adjacent abutting transverse metal strip to hold themetal strip in abutting relation, and an electric heater supported uponsaid insulators, the opposite ends of said transverse metal strips beingprovided with integral downwardly extending projections forming supportsfor the assembly.

2. A heating unit assembly including a plurality of spaced parallelinsulator supports formed of metal strips, insulators supported by saidsupports, transverse metal strips abutting the opposite ends of saidinsulator supports, said insulator supports being provided at each endwith upper and lower projections which curl around the adjacent portionof the adjacent abutting transverse metal strip to hold the metal stripin abutting relation, an electric heater supported upon said insulators,a bathe extending over said heater and insulator supports, one of saidtransverse strips having upwardly extending projections for supportingone end of said baie, the other end of said battle being provided with adownwardly extending flange resting upon the second transverse strip.

3. A heating unit assembly including a plurality of spaced parallelinsulator supports formed of metal strips, insulators supported by saidsupports, transverse metal strips abutting the opposite ends of saidinsulator supports, said insulator supports being provided at each endwith upper and lower projections which curl around the adjacent portionof the adjacent abutting transverse metal strip to hold the metal stripin abutting relation, an electric heater supported upon said insulators,a bafe extending over said heater and insulator supports, one of saidtransverse strips having upwardly extending projections for supportingone end of said bale, the other end of said bafe being provided with adownwardly extending ange provided with a plurality of flanged openingstherein, the anges ot at least one of said openings resting upon thesecond transverse strip.

4. A heating unit assembly including a plurality of spaced parallelinsulator supports formed of metal strips, insulators supported by saidsupports, transverse metal strips abutting the opposite ends of saidinsulator supports, said insulator supports being provided at each endwith upper and lower projections which curl around the adjacent portionof the adjacent abutting transverse metal strip to hold the metal stripin abutting relation, an electric heater supported upon said insulators,a bafe extending over saidv heater and insulator supports, one of saidtransverse strips having upwardly extending projections for supportingone end of said batiie, the other end of said bafe being provided with adownwardly extending flange provided with a plurality of anged openingstherein, the flanges of at least one of said openings resting upon thesecond transverse strip, the flange of said baille being provided with aprojection extending into engagement with said second transverse strip.

5. A heating unit assembly including a plurality of spaced parallelinsualtor supports formed of metal strips, insulators supported by saidsupports, transverse metal strips abutting the opposite ends of saidinsulator supports, said insulator supports being provided at each endwith upper and lower projections which curl around the adjacent portionof the adjacent abutting transverse metal strip to hold the metal stripin abutting relation, and an electric heater supported upon saidinsulators, said electric heater being connected to a terminal block,one of said transverse strips being provided with a flanged openinghaving a horizontally extending tab, said terminal block being lodgedwithin said flanged opening, and means fastening said terminal-block tosaid tab.

References Cited in the le of this patent UNITED STATES PATENTS1,220,781 Parkhurst Mar. 27, 1917 1,479,718 Hewitt Jan. 1, 19241,705,727 Forshee Mar. 19, 1929 2,189,622 Barnsteiner et al. Feb. 6,1940 2,442,900 McCormick June 8, 1948

